you have to make sure you dot all the eyes and cross all the t's, because you have a cold blooded killer out there. >> by now the relentless investigation had reached las vegas where dorner's house was searched. day three and la palma became another stop on the manhunt to search the home of dorner's mother. >> they're going to check out his friends, his family, acquaint enss, anybody at all who he may have had contact with in the last year, to find out, okay, have you had any contact with this guy? has he been using any kind of credit cards, atm card? has he been texting, twittering, on facebook, e-mails? >> day four, still no sign. big bear continued to be ground zero in the hunt for christopher dorner. that evening the los angeles police department announced a new investigative strategy, a joint task force.